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SIP messages are sent directly to the peer and not to the SIP-Proxy when both peers are inside the NAT.
Some SIP messages may not be seen by the SIP-Proxy and cause missed messages and accounting gaps.
-- CGNAT and SIP-ALG are configured. -- Peer1 and Peer2 are in the NAT'd network (subscribers). -- SIP-Proxy is located outside the NAT network (internet).
None
SIP messages through the SIP-ALG are no longer hairpinned when the destination address is not inside the NAT.
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